CN1409105A - Measuring method and probe for degree of saturation containing oil - Google Patents
Measuring method and probe for degree of saturation containing oil Download PDFInfo
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- CN1409105A CN1409105A CN 01123944 CN01123944A CN1409105A CN 1409105 A CN1409105 A CN 1409105A CN 01123944 CN01123944 CN 01123944 CN 01123944 A CN01123944 A CN 01123944A CN 1409105 A CN1409105 A CN 1409105A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000523 sample Substances 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000005684 electric field Effects 0.000 claims abstract description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 11
- 239000011435 rock Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002247 constant time method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001225 nuclear magnetic resonance method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
A measuring method and its measuring probe for the oil saturation degree relating to a petroleum engineering measurement have at least one potential electrode system established in the object to be measured. The established potential electrode system consists of a pair of power supply electrodes, a pair of measuring electrodes and potential measuring instrument, and an electric field is set up in the stratum with the carrent supplied from the power supplying electrodes for using a potential measuring instrument to measure the potential difference of the electrodes. The present invention provides a measuring method for measuring the point saturation and its measuring probe which can carry out the real-time measuring of saturation degree of oil containing at a certain point and its dynamic change of the object to be measured.
Description
Technical field:
The present invention relates to measure in a kind of petroleum engineering measuring method and the instrument, particularly petroleum engineering oil-containing medium the measuring method and the surveying instrument of oil saturation.
Background technology:
During experimental study oil in porous mediums such as natural core, fill out sand tube, three-dimensional model-water two phase fluid flow, how every bit profit content is that the dynamic change of oil saturation is a global difficult problem in the measuring media, measuring main method about saturation degree at present has: X ray CT method, X ray absorption process, nuclear magnetic resonance method, microwave absorbing method and gamma-ray decay saturation degree detection method, above-mentioned each method all is variations of measurement model section average staturation, does not have the method and the instrument of measurement point saturation degree.
Summary of the invention:
The invention provides a kind of measuring method of measurement point saturation degree and the measuring sonde that this method relates to, can measure some oil saturations of measurand and dynamic change thereof in real time.
Technical scheme of the present invention is: set up a normal sonde in measurand at least, described normal sonde comprises a pair of transmitting electrode, a pair of potential electrode and potential measurement instrument, by the transmitting electrode supplying electric current, in the stratum, set up electric field, potential electrode is carried out potential difference measurement with the current potential measuring instrument.
Above-mentioned normal sonde links to each other with the potential measurement instrument with oil saturation measuring sonde insertion measurand and with power supply and combines;
Described oil saturation measuring sonde comprises an insulation elongate cylinder probe, the periphery that described probe probes into the part of measurand keeps at a certain distance away and is provided with three belt electrodes, and described three belt electrodes have lead to be drawn out in the probe on three contacts of ground upper end of probe respectively; The contact that links to each other with the most subaerial belt electrode in three contacts links to each other with power supply, and two contacts have lead to link to each other with the potential measurement instrument respectively in addition.
Above-mentioned electrode is a silver electrode.
Belt electrode that links to each other with power supply on the above-mentioned probe and power supply constitute transmitting electrode, and two belt electrodes that link to each other with the potential measurement instrument constitute potential electrode in addition.Because electrically widely different of local water and crude oil, common formation water resistivity is lower, crude oil resistivity (10
9-10
16Ohm meter) approach infinity is so rock electricity can reflect the variation of water saturation.Under the effect of extra electric field, the total current by rock is conduction current and displacement current sum, and the former is relevant with rock conductivity, and the latter is relevant with the specific inductive capacity of rock, when the frequency shift of outfield, the rock electricity lead with specific inductive capacity all be frequency function.Select to be fit to the frequency range of measurement, belt electrode by the power supply utmost point is supplied with the measurand formation currents, set up electric field in the stratum after, the electric current that other two belt electrodes of probe periphery are experienced stratum media changes, and with surveying instrument two electrodes is carried out potential difference measurement.This potential difference (PD) has reflected electric field distribution characteristic, thereby the reflected resistance rate changes.Measurement by potential difference (PD) just can be calculated the saturation degree of each measurement point after every coefficient of measurand is determined.Therefore adopt method of the present invention and measuring sonde, can measure that every bit profit content is the dynamic change of oil saturation in the measurand.
Description of drawings:
Fig. 1 is a normal sonde synoptic diagram of the present invention;
Fig. 2 is that the present invention measures the structural representation with probe.
Embodiment:
The ground upper end 2 of insulation probe 1 has three contacts in the accompanying drawing 2, the bottom excircle of probe 1 is provided with three silver electrodes, is respectively A electrode 3 from top to bottom, M electrode 4,5, three electrodes of N electrode have lead to link to each other with three contacts of ground upper end respectively in probe 1.Fig. 1 has reflected the position that is provided with of transmitting electrode and potential electrode, and wherein B power supply 6 links to each other with the A electrode 3 of probe 1, and M electrode 4 links to each other with pressure measuring instrument 7 with N electrode 5.
In measurand, set up a plurality of electrode systems shown in Figure 1.
Low frequency (the frequency stepping is adjustable) square wave ac is supplied with in resistivity measurement, measures the potential difference (PD) Δ U between M and the N
MN, and be calculated as follows resistivity:
K is a K factor, and it is only relevant with electrode system size, type.
Suppose that medium is a homogeneous isotropism, its resistivity is R, is the centre of sphere with the point source, is that radius is made a ball with r.Current density is on ball
According to Ohm law differential form,
The E integration is got
If electrode system is made up of A, M, N, then
Then
K factor is:
1. the principle of design of electrode system
(1) electrode system determining dimensions
Four electrode: A, B of the electrode system that adopts are the power supply utmost point, and M, N are potential electrode.Will be in finite medium accurate measured resistivity, the electrode system size should be too not big, could satisfy the condition of point source.
(2) investigative range
Spread of electrodes has determined the investigative range of electrode system, spread of electrodes L=AM+MN/2, and the radius of investigation of electric electrode system is about 2 times of spread of electrodes in uniform dielectric; It is L that lateral sonde gets radius of investigation.
(3) electrode system has stable psychometric performance
(4) certain mechanical strength is arranged
(5) mutually insulated between electrode
(6) electrode system will have extendability and compatibility
In order to understand saturation distribution better, provide multiple metering system (point is surveyed, and alternately measures potential measurement and gradiometry); Inter-well test.
2. K factor determines
In the even infinitely great medium of known conductivity, demarcate the K value of each electrode system, and contrast with numerical result.
3. three belt electrodes on the measuring sonde electrode bar of the present invention are selected silver electrode for use, and should accurately locate.
4. the calculating of oil saturation
(1) by Archie equation:
In the formula: Rt---rock contains water resistance fully;
Ro---the complete moisture resistivity of rock;
Sw---water saturation;
B---coefficient;
N---saturation degree prime number.
(2) determine the method for n
Rock experimental method: column rock core displacement test method.
Experience factor: clean sandstone is generally got a=b=1, m=n=2.
Following processes is based on the normal sonde logging principle, and the inner water saturation of uniform dielectric changes the research thinking that proposes in the monitoring displacement process:
Make proven measuring sonde → making change in resistance in the model of electrode system → measurement displacement process → the determine b of model, the saturation degree of n value → each measurement point of calculating are housed
Major advantage of the present invention be can the experiments of measuring model in every bit profit content be the dynamic change of oil saturation.
Claims (4)
1. oil saturation measuring method, it is characterized in that in measurand, setting up at least a normal sonde, described normal sonde comprises a pair of transmitting electrode, a pair of potential electrode and potential measurement instrument, by the transmitting electrode supplying electric current, in the stratum, set up electric field, potential electrode is carried out potential difference measurement with the current potential measuring instrument.
2. oil saturation measuring method according to claim 1 is characterized in that described normal sonde inserts measurand with an oil saturation measuring sonde and links to each other with the potential measurement instrument with power supply combining.
3. oil saturation measuring method according to claim 2, it is characterized in that described oil saturation measuring sonde comprises an insulation elongate cylinder probe, the periphery that described probe probes into the part of measurand keeps at a certain distance away and is provided with three belt silver electrodes, and described three belt electrodes have lead to be drawn out in the probe on three contacts of ground upper end of probe respectively.
4. oil saturation measuring method according to claim 3, it is characterized in that the contact that links to each other with the most subaerial belt electrode in three contacts of ground upper end of described oil saturation measuring sonde links to each other with power supply, two contacts have lead to link to each other with the potential measurement instrument respectively in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01123944 CN1200273C (en) | 2001-08-07 | 2001-08-07 | Measuring method and probe for degree of saturation containing oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01123944 CN1200273C (en) | 2001-08-07 | 2001-08-07 | Measuring method and probe for degree of saturation containing oil |
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| Publication Number | Publication Date |
|---|---|
| CN1409105A true CN1409105A (en) | 2003-04-09 |
| CN1200273C CN1200273C (en) | 2005-05-04 |
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| CN 01123944 Expired - Fee Related CN1200273C (en) | 2001-08-07 | 2001-08-07 | Measuring method and probe for degree of saturation containing oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373920A (en) * | 2010-08-20 | 2012-03-14 | 中国石油天然气股份有限公司 | Method for solving oil and water-containing saturation of quasi oil layer |
| CN110863809A (en) * | 2019-10-22 | 2020-03-06 | 中国石油化工股份有限公司 | Method for compositely displacing oil by utilizing electric field and microorganisms |
| CN111965222A (en) * | 2020-08-14 | 2020-11-20 | 中国石油大学(北京) | Rock core oil saturation monitoring device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI588497B (en) * | 2015-08-10 | 2017-06-21 | 桓達科技股份有限公司 | Method for measuring dielectric coefficient of material |
-
2001
- 2001-08-07 CN CN 01123944 patent/CN1200273C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373920A (en) * | 2010-08-20 | 2012-03-14 | 中国石油天然气股份有限公司 | Method for solving oil and water-containing saturation of quasi oil layer |
| CN102373920B (en) * | 2010-08-20 | 2014-11-26 | 中国石油天然气股份有限公司 | Method for solving oil and water-containing saturation of quasi oil layer |
| CN110863809A (en) * | 2019-10-22 | 2020-03-06 | 中国石油化工股份有限公司 | Method for compositely displacing oil by utilizing electric field and microorganisms |
| CN110863809B (en) * | 2019-10-22 | 2022-01-28 | 中国石油化工股份有限公司 | Method for compositely displacing oil by utilizing electric field and microorganisms |
| CN111965222A (en) * | 2020-08-14 | 2020-11-20 | 中国石油大学(北京) | Rock core oil saturation monitoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1200273C (en) | 2005-05-04 |
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